Bug 2491581 (CVE-2026-48746)

Summary: CVE-2026-48746 vllm: starlette: vLLM: Critical authentication bypass allows unauthorized API access
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: adudiak, alinfoot, anpicker, anthomas, aprice, bbrownin, bparees, dfreiber, drow, dschmidt, dtrifiro, ehelms, erezende, ggainey, hasun, ilpinto, jburrell, jdobes, jfula, jkoehler, jlanda, jowilson, jsamir, juwatts, jwong, kaycoth, kshier, lphiri, ltomasbo, mbarnett, mhayden, mhulan, nmoumoul, nyancey, oezr, omaciel, ometelka, orabin, osousa, pcreech, prwatson, ptisnovs, rbryant, rchan, rjohnson, sdoran, simaishi, smallamp, stcannon, syedriko, teagle, tmalecek, ttakamiy, vkumar, weaton, xdharmai, yguenane, ykashtan
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in vLLM, an inference and serving engine for large language models (LLMs). This vulnerability, residing in ASGI web servers and Starlette's trust in them, allows an attacker to bypass the OpenAI API Authentication Middleware. This bypass enables unauthorized access to the API without requiring the configured VLLM_API_KEY or --api-key, leading to critical unauthorized operations.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2492122    
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Description OSIDB Bzimport 2026-06-22 23:01:20 UTC 
vLLM is an inference and serving engine for large language models (LLMs). From 0.3.0 until 0.22.0, a vulnerability in ASGI web servers and starlette's trust on those web servers enables an authentication bypass of the OpenAI API AuthenticationMiddleware. It allows to use the API without providing the configured VLLM_API_KEY or --api-key. This vulnerability is fixed in 0.22.0.